W[0] equals W[0] equals ...

// 64 bit uint used as 8x8 gameboard bitmap
// what am i doing with my life
#include <stdio.h>
#include <stdint.h>
// #define UINT64_C(c) c ## ULL

uint64_t  W[4] = {1,1,1,1}, B[4] = {1,1,1,1}, WhiteSet,BlackSet,CollisionSet;
/* 0  0  0  0  0  0  0  0
   0  0  0  0  0  0  0  0
   0  0  0  0  0  0  0  0
   0  0  0  0  0  0  0  0
   0  0  0  0  0  0  0  0
   0  0  0  0  0  0  0  0
   0  0  0  0  0  0  0  0
   0  0  0  0  0  0  0  1 */

// return 1 if success
int lshift_white(uint64_t selected_piece, unsigned int shift_amount)
{
        if (!((CollisionSet ^ ((selected_piece) << shift_amount)) == CollisionSet)) {
                WhiteSet = WhiteSet ^ (selected_piece);
                selected_piece = (selected_piece) << shift_amount;
                WhiteSet = WhiteSet & (selected_piece);
                CollisionSet = WhiteSet & BlackSet;
                return 1;
        } else {
                return 0;
        }
}

int main(int   argc, char  *argv[])
{
        printf("W[0] equals ", W[0], "\n");
        B[0] = B[0] << 62;           // 1st byte is    01000000
        B[1] = B[1] << 57;           // 1st byte is    00000010
        B[2] = B[2] << 55;           // 2nd byte is    10000000
        B[0] = B[0] << 48;           // 2nd byte is    00000001
        W[1] = W[1] << 15;           // 7th byte is    10000000
        W[3] = W[3] <<  8;           // 7th byte is    00000001
        W[0] = W[0] <<  6;           // 8th byte is    01000000
        W[2] = W[2] <<  1;           // 8th byte is    00000010
        printf("W[0] equals ", W[0], "\n");
        BlackSet = B[0] & B[1] & B[2] & B[3];
        WhiteSet = W[0] & W[1] & W[2] & W[3];
        CollisionSet = BlackSet & WhiteSet;
        printf("W[0] equals ", W[0], "\n");
        int x = lshift_white(W[0], 1);
        printf("W[0] equals ", W[0], "!");
        return 0;
}